116 行
2.2 KiB
C
116 行
2.2 KiB
C
/*************************************************************************
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* *
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* YAP Prolog %W% %G% *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-2012 *
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* *
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**************************************************************************
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* *
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* File: YapCompounTerm.h *
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* mods: *
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* comments: main header file for YAP *
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* version: $Id: Yap.h,v 1.38 2008-06-18 10:02:27 vsc Exp $ *
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*************************************************************************/
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/*************************************************************************************************
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High level macros to access arguments
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*************************************************************************************************/
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#ifndef YAPCOMPOUNDTERM_H
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#define YAPCOMPOUNDTERM_H 1
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EXTERN Int Yap_unify(Term a,Term b);
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EXTERN inline Term Deref(Term a);
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EXTERN inline Term Deref(Term a)
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{
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while(IsVarTerm(a)) {
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Term *b = (Term *) a;
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a = *b;
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if(a==((Term) b)) return a;
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}
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return(a);
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}
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EXTERN inline Term Derefa(CELL *b);
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EXTERN inline Term
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Derefa(CELL *b)
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{
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Term a = *b;
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restart:
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if (!IsVarTerm(a)) {
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return(a);
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} else if (a == (CELL)b) {
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return(a);
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} else {
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b = (CELL *)a;
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a = *b;
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goto restart;
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}
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}
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inline EXTERN Term ArgOfTerm (int i, Term t);
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inline EXTERN Term
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ArgOfTerm (int i, Term t)
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{
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return (Term) (Derefa (RepAppl (t) + (i)));
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}
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inline EXTERN Term HeadOfTerm (Term);
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inline EXTERN Term
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HeadOfTerm (Term t)
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{
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return (Term) (Derefa (RepPair (t)));
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}
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inline EXTERN Term TailOfTerm (Term);
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inline EXTERN Term
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TailOfTerm (Term t)
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{
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return (Term) (Derefa (RepPair (t) + 1));
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}
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inline EXTERN Term ArgOfTermCell (int i, Term t);
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inline EXTERN Term
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ArgOfTermCell (int i, Term t)
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{
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return (Term) ((CELL) (RepAppl (t) + (i)));
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}
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inline EXTERN Term HeadOfTermCell (Term);
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inline EXTERN Term
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HeadOfTermCell (Term t)
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{
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return (Term) ((CELL) (RepPair (t)));
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}
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inline EXTERN Term TailOfTermCell (Term);
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inline EXTERN Term
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TailOfTermCell (Term t)
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{
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return (Term) ((CELL) (RepPair (t) + 1));
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}
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#endif /* YAPCOMPOUNDTERM_H */
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